|0 to 50
|Air quality is considered satisfactory, and air pollution poses little or no risk
|51 to 100
|Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
|Unhealthy for Sensitive Groups
|101 to 150
|Members of sensitive groups may experience health effects. The general public is not likely to be affected.
|151 to 200
|Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
|201 to 300
|Health warnings of emergency conditions. The entire population is more likely to be affected.
|301 to 500
|Health alert: everyone may experience more serious health effects
|Data originates from
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